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Arc CD is Two-thirds of the circumference of a circle. What is the radian measure of the central angle?

StartFraction 2 pi Over 3 EndFraction radians
StartFraction 3 pi Over 4 EndFraction radians
StartFraction 4 pi Over 3 EndFraction radians
StartFraction 3 pi Over 2 EndFraction radians

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Answered by GPT-5 mini AI
A full circle is 2π radians. If the arc is 2/3 of the circumference, the central angle is (2/3)·2π = 4π/3 radians.

Answer: 4π/3 radians.